package com.example;

import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.regex.Pattern;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

public class MainTest {
    @Test
    @DisplayName("printWelcome prints correct welcome message")
    void testPrintWelcome() {
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        Main.printWelcome();

        System.setOut(originalOut);
        String output = outContent.toString().trim();
        Pattern pattern = Pattern.compile(
            "welcome\\\\s+to\\\\s+the\\\\s+java\\\\s+methods\\\\s+challenge!",
            Pattern.CASE_INSENSITIVE
        );
        assertTrue(pattern.matcher(output).find(), "Expected welcome message, got: '" + output + "'");
    }

    @Test
    @DisplayName("showInstructions prints correct instruction message")
    void testShowInstructions() {
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        Main.showInstructions();

        System.setOut(originalOut);
        String output = outContent.toString().trim();
        Pattern pattern = Pattern.compile(
            "follow\\\\s+the\\\\s+instructions\\\\s+carefully\\\\s+to\\\\s+complete\\\\s+the\\\\s+task\\\\s*\\\\.",
            Pattern.CASE_INSENSITIVE
        );
        assertTrue(pattern.matcher(output).find(), "Expected instructions message, got: '" + output + "'");
    }

    @Test
    @DisplayName("printCompletion prints correct completion message")
    void testPrintCompletion() {
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        Main.printCompletion();

        System.setOut(originalOut);
        String output = outContent.toString().trim();
        Pattern pattern = Pattern.compile(
            "congratulations!\\\\s+you\\\\s+have\\\\s+completed\\\\s+the\\\\s+challenge\\\\s*\\\\.",
            Pattern.CASE_INSENSITIVE
        );
        assertTrue(pattern.matcher(output).find(), "Expected completion message, got: '" + output + "'");
    }

    @Test
    @DisplayName("main prints all messages in order")
    void testMainAllMessages() {
        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
        PrintStream originalOut = System.out;
        System.setOut(new PrintStream(outContent));

        Main.main(new String[]{});

        System.setOut(originalOut);
        String output = outContent.toString().toLowerCase();
        int idxWelcome = output.indexOf("welcome to the java methods challenge!");
        int idxInstructions = output.indexOf("follow the instructions carefully to complete the task.");
        int idxCompletion = output.indexOf("congratulations! you have completed the challenge.");
        assertTrue(idxWelcome != -1, "Welcome message missing");
        assertTrue(idxInstructions != -1, "Instructions message missing");
        assertTrue(idxCompletion != -1, "Completion message missing");
        assertTrue(idxWelcome < idxInstructions && idxInstructions < idxCompletion,
            "Messages are not printed in the correct order");
    }
}

MainTest.java

Une introduction pratique aux méthodes Java, au transfert de données et au comportement du compilateur. Présentation de la déclaration, de l'invocation et de la surcharge des méthodes, de la gestion des paramètres et des arguments, de la compréhension du passage par valeur et de l'implémentation de la récursivité pour la résolution de problèmes.

Défi : Création de Méthode de Base

Solution